Wrench.



A. DAHL.

WRENCH.

(Appheation filed Apr. 80, 1902.)

(No Model-) wanna gflvwentoz m4, wa 1 UNITED STATES PATENT OFFICE.

AXEL DA H L, OF NORTH TARRYTOWVN, NEW YORK.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 708,210, dated September 2, 1902.

Application filed April 30 1902- fication.

My invention relates to pipe-wrenches, and has for its object to provide such wrenches specially adapted to avoid flattening and cracking or splitting the pipes, which is very common in the use of V pipe-wrenches as now constructed; also to provide improved adjusting and clutching devices for the movable jaw, as hereinafter described, reference being made to the accompanying drawings, in which-- Figure 1 is a side view of my improved pipewrench. Fig. 2 is an endview as seen looking from the top of Fig.1, Fig. 3 is an elevation as seen looking from the right hand of Fi 1. i

Z and B represent the jaws, and G the lever. ,Both of the jaws havefnotched confronting faces, whereof the twosid es d are about in right-angular .relationto each other for biting effect at four equidistant points in the circumference of the pipe or thereabout, whereby the flattening or crushing effect on the pipe is reduced at least half and probably much more as comparedwith wrenches acting only at two opposite points. The bitingfaces are serrated, asusual.

The jaw A consists of a'flat bar bent at the middle e sidewise and nearly doubled on itself, forming two cheeks f, connected by the web e, with aspace between them, wherein, near one end, the lever O is pivoted at g, and the shank Zof jaw B has sliding way between said lever and web 6. The extremities of the cheeks f are stayed by pins h, riveted or headed in to prevent them from spreading. The lever has alateral enlargement vi of the end portion of'the side fronting the shank of jaw B, on the face'of which enlargement are ratchet-teeth j, with which otherteeth 70 on the confronting. side of the shank Z of jaw B coact to hold the jaws to the work when gripping a pipe. Between web 6 and shank Z there is space for allowing the shifting of'the shank for releasing the teeth of said shank them in engagement.

Serial No 105,254. (No model.

from teeth is when jaw B is to be shifted, and aspring m isfplaced in the space for keeping Between the cheeks f and forward of the end of the lever a rollerbearing to is located for a fulcrum on which to disengage the toothed shank of jaw B from teeth j by pressing shank Z outward from the notched part t of the lever. Such pressure can be applied to the inner endof shank Z by the thumbof the hand grasping the lever in close proximity to the end of shank l, and at the same time the shank can be pushed along for opening the jaws. Pressure on the back of jaw B by one hand While holding the lever in the other hand will close the jaws. From a radius of,.the lever-pivot 9 (indicated by the dotted line 19) to the extremity of the lever the toothed part i of the lever O is curved, as shown at q, or theteeth may be shortened to facilitate disengagement with less swing on the fulcrum. n. From the line 19 in the other direction the teeth are in a straight line, with which the toothed face of shank Z is parallel when the Wrench is under working stress, and thus suchlplurality of teeth are engaged as affords ample strength with comparatively fine teeth; affording fine adjustment of the jaws. The'fulcrum 11 may of course consist of a fixed or non-rolling device; but it is manifestly better if made to roll on account of working easier.

Instead of making the jaw A of a bent flat plate with the extremities of the cheeks pinned together, a solid piece may be slotted for reception-of the lever and the shank of themovable jaw, and my invention isnot limited in this respect to the particular construction shown.

What I claim as'my invention is 1. Inan adjustable pipe-wrench, the combination of two jaws each having a notched and serrated face formed in two parts having angular relation to each other adapting the two jaws to have biting efiect at four points in the circumference of the pipe, the lever pivoted at one end in the space between the cheeks of one of said jaws,a shank of the other jaw sliding in the said space, clutching-teeth on said shank and lever respectively adapted to be unclutched for adjusting the jaws, and a spring for normally maintaining the clutched condition of the shank and lever.

2. In an adjustable pipe-wrench, the combination of two jaws each having a serrated face adapted to have biting effect on the pipe, the lever pivoted at one end in the space between. the cheeks of one of the jaws, a shank of the otherjaw sliding in the said space, clutching-teeth on said shank and lever respectively adapted to be unclutched for adjusting the jaws, a spring for normally maintaining the clutched condition of the shank and lever and afulcrum for the jaw-shank located in the space between the cheeks of the jaw wherein the lever is pivoted and in advance of the pivot to facilitate unclutching said jaws.

3. In an adjustable pipe-wrench, the combination of two jaws each having a serrated face adapted to have biting eifect on the pipe, the lever pivoted at one end in the space between the cheeks of one of the jaws, a shank pivot, the toothed face of the lever being reduced radially to the pivot between the transverse axial line of the lever and the fulcrum to favor unclntching the teeth.

Signed at North Tarrytown this 25th day of April, 1902.

AXEL DAI-IL.

Witnesses:

HARRY G. DAHL, J. BENEDICT SEE. 

